Table 16 Pseudo Code of RGB multiple image encryption over GI.

From: Multiple color images security by SPN over the residue classes of Gaussian integer \(\:Z{\left[i\right]}_{h}\)

//Step 1: Input Preparation

Input: Set of RGB images

For each RGB image in the set:

Split the image into three channels: Red, Green, Blue

Convert each channel into a matrix of pixel values over Gaussian integer residue class Z[i]

// Step 2: S-Box Construction

Construct two 8 × 8 S-boxes:

S1 = S-box for substitution (using properties of Z[i])

S2 = S-box for permutation (using properties of Z[i])

// Step 3: Substitution-Permutation Network (SPN) Structure

For each pixel in the Red, Green, and Blue channels:

// Substitution Step

Apply S1 to substitute each pixel value in the channel

// Permutation Step

Apply S2 to permute pixel positions in the channel

// Step 4: XOR Operation for Enhanced Permutation

For each pixel in the Red, Green, and Blue channels:

// XOR Operation

Perform XOR between the substituted pixels (from S1) and permuted pixels (from S2)

Generate a third S-box S3 by combining the XOR result

Apply S3 to each pixel in the channels

// Step 5: Final Encryption Transformation

For each RGB channel:

Sequentially apply the SPN framework (S1 for substitution, S2 for permutation, and S3 for XOR) across all pixels

// Step 6: Output the Encrypted Image

Combine the encrypted Red, Green, and Blue channels to reconstruct the encrypted RGB image

// Step 7: Final Output

Output: Set of encrypted images with high entropy, low correlation, and enhanced security

Back to article page